On 06/30/2016 08:06 PM, Brian Gerst wrote: >> > It's not like anybody will ever care about 32-bit page tables on >> > Knights Landing anyway. > Could this affect a 32-bit guest VM? This isn't about 32-bit *mode*. It's about using the the 32-bit 2-level _paging_ mode that supports only 4GB virtual and 4GB physical addresses. That mode also doesn't support the No-eXecute (NX) bit, which basically everyone needs today for its security benefits. Even the little Quark CPU supports PAE (64-bit page tables). -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>